转载：http://blog.csdn.net/hediping9811/article/details/23341387

（1）用Word编辑好帮助文档，并保存为网页格式，如mhtml格式。

（2）用EasyCHM软件生成chm文档。生成方法很简单的，相信你能很快搞定的！当然用其它方法制作CHM文档也可以了。

（3）在MFC中添加一个菜单或按钮，添加相应的响应函数。

（4）在函数体内用 ShellExecute(NULL,"open",".\\help.chm",NULL,NULL,SW_SHOWMAXIMIZED);

说明：\\help.chm 为文件路途和文件名，\\为当前目录

SW_SHOWMAXIMIZED 为最大化文档窗口，参考MSDN，还有如下一些参数可选：

	SW_HIDE	Hides the window and activates the executable file.
	SW_MAXIMIZE	Maximizes the window.
	SW_MINIMIZE	Minimizes the window. The next top-level window in the Z-order is activated.
	SW_RESTORE	Activates the window even if it is hidden or minimized
	SW_SHOW	Activates the window and displays it in its original size and at its original position.
	SW_SHOWMAXIMIZED	Activates the window. The window is displayed as maximized.
	SW_SHOWMINIMIZED	Activates the window. The window is displayed as minimized.
	SW_SHOWMINNOACTIVE	Activates the window as minimized. The active window retains the focus.
	SW_SHOWNA	Activates the window in its current state but the active window retains the focus.
	SW_SHOWNOACTIVATE	Displays the window in its most recent size and in its most recent position. The active window retains the focus.
	SW_SHOWNORMAL	Displays the window in its original size and at its original position.